Telephone mouth-piece



I (Nu ModeL) J. MILLER.

TELEPHONE MOUTH PIECE. No. 337,972. Patented Mar. 16, 1886.

UNITED STATES PATENT OFFICE.

JAMES MILLER, OF DETROIT, MICHIGAN.

TELEPHONE MOUTH-PIECE.

$PECIPICATION forming part of Letters Patent No. 337,972, dated March 16, 1886.

Application filed May 13, 1885.

T0 to whom it may conce n:

Be it known that I, JAMEs MILLER, of Detroit, in the county of Vayne and State of Michigan, have invented new and useful Improvements in Telephone-Transmitters; and I dohereby declare that thefollowing is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to certain new and useful improvements in speaking-tubes for telephonertransmitters and in means for at taching the same; andit consistsin the peculiar combinations and the novel construction and arrangements of parts, all as hereinafter more fully set forth and claimed.

In the drawings which accompany this specification, my invention is shown in perspective in Fig. 1, and in section in Fig. 2, to show the means of securing the speaking-tube to the transmitter.

A represents a glass tube, conical in form from a to the outer end, Z). From a to c the side walls of this tube are parallel and terminate in ashoulder extending from c to (Z, from which'point to the inner or smaller end, 6, the tube is again conical.

B isa wooden plate having an orifice therein, with parallel sides to receive that portion of the tube which is formed with the parallel sides between a and c.

O are metallic fastenings, preferably made of wire in the form shown, extending into the ends oftheplateB in recesses formed therein for the purpose, and, projecting from the ends of said plate 13, terminate in hooks h, by means of which the device is attached to the front of Serial No. 165,303. (No modem the transmitter; and set-screws k, passing through the front of the plate, engage with the wire fastenings in their recesses and allow the same to be extended or retracted as may be necessary to bring the axis of the tube into coincidence with the center of the diaphragm in the transmitter.

The utility of this attachment to the transmitter will readily be seen by every electrician and user of telephones, for experience has shown that by its use the vibrations of the diaphragm caused by the concussion of the air in talking into the instrument are much more pronounced and distinct, so that talking at long distance can be readily done by speak- WVhat I claim as my invention is 1. Thecombinatiomwith the plate B, having a parallel-sided orifice and means for attaching said plate to a telephone-transmitter, of the glass mouth-piece A, conical in form from a to b, and with parallel side walls from a to c, engaging the walls of the orifice in said plate, as set forth.

2. The plate 13, carrying the glass mouthpiece A and having formed therein the recesses, as shown, the fastenings 0, extending into said recesses and terminating in hooks 71., and the set-screws k, passing through the front of the plate and bearing on said fasten ings, all combined, arranged, and operating as set forth.

JAHES MILLER.

IVit-nesses:

H. S. SPRAGUE, CHARLES J. HUNT.

mg in a quite low tone of voice,but distinctly. 

